DOC《循环流态化固硫固砷焙烧金矿的试验及应用实践》

循环流态化固硫固砷焙烧金矿的试验及应用实践 李云1 张立征2 靳冉功1 刘洪晓3 王云1 (1.

北京矿冶研究总院, 北京100160;

2. 招金矿业股份有限公司, 山东招远265400 3. 新疆星塔矿业有限公司, 新疆托里834500;

) 摘要:采用循环流态化固硫固砷焙烧金矿的结果表明,对低硫精矿在650℃焙烧条件下,添加氧化钙达到精矿中硫砷反应的计量点,即ω(CaO/精矿)=0.12时,固硫率达到75.5%、固砷率达到95.3%;

同样,对碱性脉石含量较高的原生金矿,在700℃焙烧条件下,固硫率达到59.4%,固砷率达到82.3%;

相应的焙砂进行氰化浸出,其金的浸出率达到最大.循环流态化焙烧强化了焙烧固硫固砷反应,在精矿与原生金矿的焙烧过程中较好地实现了自洁生产 关键词: 循环流态化焙烧 固硫 固砷 含砷金矿 氰化浸出 中文分类号:TF831 文献标识码: 文章编号: Application and experiment of Sulfur and Arsenic Stabilization By Circulating Fluid Bed Roasting Arsenic-bearing Gold Ores Li Yun1 Zhang Lizheng2 Jin Rangong1 Liu Hongxiao3 Wang Yun1 ( 1. Beijing General Research Institute of Mining &

Metallurgy, Beijing 100160, China 2. Zhaojin Mining Co Ltd, Shandong Zhaoyuan City

265400 3. Xinjiang Xingta Kuangye Co. Ltd. , Xinjiang Tuoli 834500, China ) Abstract:Arsenic-bearing gold ores was preheated by circulating fluid bed(CFB) roaster, while arsenic and sulfur of gold ores was fixed in calcine. The result shown that the S stabilization efficiency was 75.5% and As stabilization efficiency was 95.3%, while the low-sulfur gold concentrate roasting at 650℃, while adding CaO to concentrate with ω(CaO/Concentrate)=0.12 during the concentrate roasting, which was reactin stoichiometric point of As and S with CaO. At the same time, the whole gold ore of much basic gangue roasting at 700℃, the S stabilization efficiency was 59.4% and As stabilization efficiency was 95.3%. The corresponding caline was leached by sodium cyanide, the high extraction efficiency of Au was obtained simultaneously. The As and S stabilization reaction was strengthened by CFB roasting, which the cleaner production of concentrate and whole gold ore roasting was realized preferably. Key words: Circulating fluid bed roasting, Arsenic and Sulfur Stabilization;

Arsenic-bearing gold ores;

Cyanide leaching 金(精)矿预氧化处理的主要三种方法为焙烧氧化、加压氧化和细菌氧化【1~3】.随着循环流态化焙烧(CFB)预处理低硫金精矿以及原生金矿的应用与生产实践【4~6】,其焙烧固砷固硫的技术优势明显.含砷含硫金(精)矿采用CFB焙烧工艺时,其特点是:(1) 可以充分利用矿粉中的碱性脉石固硫固砷,实现清洁生产与降低生产成本;

(2) 脱硫剂利用率高,在较低的Ca/S(摩尔比)下可达到较高的固硫固砷率,显著减少尾气中砷与硫含量,同时尾气治理规模与产生的渣量减小;

(3)当采用煤为热源时,由于矿物中含有大量的铁基组分,可除一定量的氮氧化物,具有显著的环保效应. 本文在金矿中加入石灰进行焙烧,焙砂氰化浸出提金.试验研究表明,对低硫精矿取得了固硫率75.5%、固砷率达到95.3%;

对原生金矿,在700℃时的固硫率达到59.4%,固砷率达到82.3%,金的浸出率达到最大87.98%.添加石灰进行焙烧的作用使砷和硫形成砷酸钙和硫酸钙留在焙砂中,从而减轻尾气中治理砷与硫的难度.在新疆星塔矿业有限公司的循环流态化焙烧低硫精矿的多年生产实践得到了,固砷率90%、固硫率80%的指标,循环流态化焙烧的强化效果得到了充分的体现.